import React, { Component } from "react";
import PropTypes from "prop-types";
import "./index.css";

export default class index extends Component {
  static propTypes = {
    checkAllTodo: PropTypes.func.isRequired,
    clearAllDone: PropTypes.func.isRequired,
  };
  handleCheckAll = event => {
    this.props.checkAllTodo(event.target.checked);
  };
  handleClearAllDone = () => {
    this.props.clearAllDone();
  };

  render() {
    const { todos } = this.props;
    //已完成的个数
    const doneCount = todos.reduce((pre, todo) => pre + (todo.done ? 1 : 0), 0);
    //总数
    const total = todos.length;

    return (
      <div className="todo-footer">
        <label>
          <input type="checkbox" onChange={this.handleCheckAll} checked={doneCount === total && total !== 0 ? true : false} />
        </label>
        <span>
          <span>已完成{doneCount}</span> / 全部{total}
        </span>
        <button onClick={this.handleClearAllDone} className="btn btn-danger">
          清除已完成任务
        </button>
      </div>
    );
  }
}
